Method for realizing coordinate conversion
A coordinate conversion and coordinate technology, which is applied in graphics and image conversion, image data processing, instruments, etc., can solve the problems of complex conversion process, inconvenient use, and poor real-time performance.
Inactive Publication Date: 2014-10-29
唐文兴
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Problems solved by technology
[0006] 1. The real-time performance is not strong. When a large error is found in a certain area, the control point cannot be obtained in time
[0007] 2. The search for known control points is time-consuming and laborious
[0008] 3. Special software conversion is required, and the conversion result must be re-imported into the GPS user terminal. The conversion process is complicated and inconvenient to use
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[0015] Coordinate type selection device (1), used to select the coordinate type that needs to be converted: the coordinate system we use is the 1954 Beijing coordinate system or the 1980 Xi'an coordinate system, namely Beijing 54 and Xi'an 80, and the coordinate system of GPS satellite positioning is WGS-84 Coordinate system whose ellipsoid parameters are:
[0016]
[0017] The semi-major axis a, the semi-minor axis b, the oblateness of the ellipse α, the first eccentricity e of the ellipse, and the second eccentricity e′
[0018] The parameters of the ellipsoid can be determined using the coordinate type selection device (1).
[0019] Parameter type selection device (2), used for parameter type selection: there are many kinds of coordinate conversion models, and the seven-parameter Bursa method can be used for coordinate conversion. If rotation parameters or scale parameters are ignored, five parameters and four parameters can be deduced , the three-parameter conversion f...
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The invention discloses a method for realizing coordinate conversion, and relates to a method for converting among different coordinates in geographical mapping. A coordinate type selecting device (1) is used for selecting a coordinate type needing to be converted; a parameter type selecting device (2) is used for selecting a parameter type; a control point coordinate acquiring device (3) is used for acquiring coordinate data of the control point; a satellite positioning control point coordinate acquiring device (4) is used for acquiring a satellite positioning control point coordinate from a satellite positioning system; a converting parameter calculating device (5) is used for calculating a coordinate converting parameter according to the parameter type of the coordinate conversion and the control point coordinate data; a storage device (6) is used for storing the coordinate converting parameter; a coordinate converting device (7) is used for converting the coordinate according to the coordinate converting parameter; a display device (8) is used for displaying a converted coordinate. The method has the positive effects that points with remarkable terrains and surface features on a screen terrain map are clicked by using the coordinate information of any point on an electronic map to acquire the control point coordinate data, and the control point coordinate data and a satellite positioning control point coordinate acquired from the satellite positioning system construct a control point coordinate, thereby realizing the calculation of parameters and conversion of the coordinate.
Description
technical field [0001] The invention relates to a conversion method between different coordinates in geographic surveying and mapping. Background technique [0002] Commonly used satellite positioning systems use a specific coordinate system, such as GPS uses the WGS-84 coordinate system, in order to make full use of the original topographic maps, engineering drawings, underground pipeline construction drawings and other data, coordinate conversion must be performed, such as WGS-84 coordinates system into my country's 80 coordinate system or 54 coordinate system, and in many cases we must also convert WGS-84 coordinates to local independent coordinates. [0003] There are many methods of coordinate transformation, the calculation is very complicated, and the language is difficult to understand. It is often necessary to use software to convert, and many software need to convert one by one. The usual method is: obtain known survey control point data; set GPS in WGS Under -84 c...
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Inventor 唐文兴
Owner 唐文兴